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Torque pulsation in a single-phase induction motor arises because

  • A.the rotor bars are skewed relative to the shaft of the machine
  • B.the auxiliary winding is disconnected once the machine has reached its running speed
  • C.the rotor has no conductors within its slots at all
  • D.the two revolving field components interact at twice supply frequency

Answer: D

The interaction produces a torque component at double frequency that the shaft and mounting have to absorb, which is why such machines hum audibly. Three-phase machines have no such component, their field being of constant magnitude.

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